Acquiring license after DUI charges have been dropped.?

Hi, awhile ago my brother was charged with DUI and his license taken away (CDL A class). But during his two court cases the sheriff that arrested him never showed up and was also fired/quit before the first case. The judge ruled that all charges were going to be dropped and the sheriff brought in under a warrant. I was just wondering, will he be able to get his normal license back? He is on a restrictive license that allows him to drive to work and school, but he can no longer drive a semi truck. With the charges being dropped, how long and what steps does he have to take to get his normal license back?

Thanks for anyone who can help.